Bi–Sr–Ca–Cu–O conductors and magnets at high stress–strain levels


Weijers, H.W. and Yoo, J.M. and Haken, B. ten and Schwartz, J. (2001) Bi–Sr–Ca–Cu–O conductors and magnets at high stress–strain levels. Physica C: Superconductivity, 357-36 (Part 2). pp. 1160-1164. ISSN 0921-4534

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Abstract:We focus on a react and wind Bi-2223 conductor with a pure silver matrix. The stress–strain–critical current relation is determined for coils with a uniform stress distribution, at 4.2 K and 19 T. Somewhat surprisingly, the coils fail at a Lorentz force induced strain value close to the value for uni-axially loaded straight samples. This implies that bending strain is only partially retained due to the plastic nature of the pure silver matrix. Also, a double-pancake coil with a 15 mm winding thickness, resulting in a non-uniform stress distribution, is tested at 4.2 K and 19 T. The coil current is cycled with increasing peak values and the onset and evolution of critical current degradation in the coil is shown.
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Copyright:© 2001 Elsevier
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Metis ID: 200061